Safety crane stop



Jan; 8, 1924.

w B. LANE SAFETY CRANE STOP Filed Sept. 1a. 1923 -F|6.4-- -F-'|G. 5-

Patented Jan. 8, 1324.

urrso vv BIRITTON LANE, or DUNKIRK, NEW YORK.

SAFETY CRANE STOP.

Application filed September 18, 1923. Serial No. 633,327.

. To all whom it may concern:

Be it known that 1, WV BRITTON LANE, a citizen of the United States, and a resident of Dunkirk, in the county of Chautauqua and State of New York, have invented a certain new and useful Improvement in Safety Crane Stops, of which improvement the following is a specification.

The object of my invention is to provide simple and effective means for the protection of repair men working on crane run ways, by which the momentum of the crane will be gradually checked in the event of running up against a stop, and also to provide a stop device of lighter weight than those of the present construction, which is usually bolted to the track rail, and to en able it to be readily applied, without the use of any tool.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawing: Figure 1 is a side view, in elevation, of a safety crane stop, embodying my invention, in position on a crane track rail; Fig. 2, a vertical transverse section through the same, on the linea a of Fig. 1; Fig. 3, a side view of a clamping plate; Fig. 4:, an end View of the same; and, Fig. 5, a view, in elevation, of the coupling yoke.

In the practice of my invention, referring descriptively to the specific embodiment thereof which is herein exemplified, the crane safety stop thereof is an integral casting, 1, having a substantial vertical plate body, on which there are formed lateral top flanges, P, by which the body is extended to sufficient width to constitute a bearing for a crane wheel, and lateral bottom flanges, by which it is similarly extended to a width substantially equal to that of the head of a crane track rail, A. The upper surface of the stop extends, first, on an incline for some distance from its point, as indicated by b, in Fig. 1; then level or parallel with its base for a short distance, as indicated at c; and thereafter is upwardly curved, to its opposite end, upon a radius substantially equal to that of a crane wheel, in connection with which it is designed for service.

Two clamping plates, at, of light gauge sheet steel, are pivoted, by a bolt, 3, near their upper ends, to the stop, 1, the lower portions of said plates being bent outwardly sufficiently to clear the head of the track rail, A, when in position on the stop, and inwardly projecting lips, 2 fitting below the head of the rail, are formed on their lower ends. The holes, 2, in the clamping plates, through which the bolt, 3, passes, are longitudinally slotted, as shown in Figs. 2 and 3, to permit the plates to be swung on the bolt, to embrace the rail, and they are held in position on the bolt, by a nut, 3.

A coupling yoke, 4, of U form, is fitted to turn freely in the body of the stop, the outer ends of the arms of the yoke being adapted to bear on the clamping plates, when turned into the position shown in Figs. 1 and 2, and hold them in contact with the sides of the rail head, without an appre ciable degree of friction. When the yoke is turned upwardly, the clamping plates may be swung outwardly, sufficiently far to enable the stop to be detached from the track rail, when desired.

The stop being adjusted on the track rail, as described, an inclined plane is presented at the stop nearer the crane, which opposes the movement of the crane when the wheel thereof comes in contact with it, and the succeeding fiat portion of the upper surface of the stop affords a rest for the wheel if it mounts the inclined plane, its further movement being arrested by the succeeding curved upper surface of the stop. The thickness of the stop, where the crane Wheel rides, is considerably less than the height of the flange of the wheel, to avoid tendency of the crane to be derailed if the stop is run into and slides on the track rail.

I claim as my invention and desire to secure by Letters Patent:

1. The combination, with a crane track rail, of a stop, fitting freely thereon, and having its upper surface formed to resist movement of a crane wheel on the rail; clamping plates, pivoted to the stop and adapted to [it against the sides of the rail; and a coupling yoke, pivoted transversely in the stop. and movable into position to hold the clamping plates in contact with the rail.

2. The combination, with a crane track rail, of a stop, fitting freely thereon and having an upper bearing surface in the form of a plane upwardly inclined from one end of the base of the stop, an adjoining portion parallel with the base, and a succeeding portion, curved to present a bearing for the periphery of a crane wheel; clamping plates, pivoted transversely on the stop, and adapted to fit against the sides of the rail; and a,

coupling yoke, pivoted transversely in the stop, and movable into position: to hold the clamping plates in contact with the r2111.

3. The combination, with a crane track rail, of a stop, fitting freely thereonand 10 rail-head" a ivob bolt connectinp' the clamo- 7 p 7 o .L

ing, plates to the stop, and fitted in slotted holes in the plates, to permit swinging: move-- ment thereof upon it; and a coupling yoke, pivoted in the stop, and adapted to bear on the cllunpingpletes V. BRITTON LANJU. Witnesses NICHOLAS J Piinsznwsm, JESSIE M-. BEARDSLEY. 

